Systems and methods to adjust a sounding reference signal timing offset

ABSTRACT

A method of wireless communication performed by a user equipment (UE) includes: operating in a Dual SIM Dual Standby (DSDS) mode in which a first subscriber identity module (SIM) is designated as a default data subscription (DDS); transmitting a sounding reference signal (SRS) from a communication port of the UE, wherein the SRS has a timing offset assigned by a network associated with the first SIM; receiving paging messages from a network associated with a second SIM; determining an offset adjustment to avoid a collision between the SRS and the paging messages; sending a request to the network associated with the first SIM to adjust the timing offset according to the offset adjustment; and receiving an offset change configuration from the network associated with the first SIM.

TECHNICAL FIELD

This application relates to wireless communication systems, and moreparticularly adjusting a sounding reference signal timing offset inmulti-subscriber identity module (MultiSim) devices.

INTRODUCTION

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). A wirelessmultiple-access communications system may include a number of basestations (BSs), each simultaneously supporting communications formultiple communication devices, which may be otherwise known as userequipment (UE).

To meet the growing demands for expanded mobile broadband connectivity,wireless communication technologies are advancing from the long termevolution (LTE) technology to a next generation new radio (NR)technology, which may be referred to as 5^(th) Generation (5G). Forexample, NR is designed to provide a lower latency, a higher bandwidthor a higher throughput, and a higher reliability than LTE. NR isdesigned to operate over a wide array of spectrum bands, for example,from low-frequency bands below about 1 gigahertz (GHz) and mid-frequencybands from about 1 GHz to about 6 GHz, to high-frequency bands such asmillimeter wave (mmWave) bands. NR is also designed to operate acrossdifferent spectrum types, from licensed spectrum to unlicensed andshared spectrum. Furthermore, as wireless communication becomes cheaperand more reliable, expectations among consumers change. Some UEmanufacturers are responding to consumer preferences by includingmultiple subscriber identity modules (SIMS) within UEs.

However, including multiple SIMS within a device may lead to scenariosin which activities by one SIM may interfere with or preclude activitiesby the other SIM. There is a need in the art for techniques to manageuse of multiple subscriptions in multi-SIM devices.

BRIEF SUMMARY OF SOME EXAMPLES

The following summarizes some aspects of the present disclosure toprovide a basic understanding of the discussed technology. This summaryis not an extensive overview of all contemplated features of thedisclosure and is intended neither to identify key or critical elementsof all aspects of the disclosure nor to delineate the scope of any orall aspects of the disclosure. Its sole purpose is to present someconcepts of one or more aspects of the disclosure in summary form as aprelude to the more detailed description that is presented later.

In one aspect of the disclosure, a method of wireless communicationperformed by a user equipment (UE) includes: operating in a Dual SIMDual Standby (DSDS) mode in which a first subscriber identity module(SIM) is designated as a default data subscription (DDS); transmitting asounding reference signal (SRS) from a communication port of the UE,wherein the SRS has a timing offset assigned by a network associatedwith the first SIM; receiving paging messages from a network associatedwith a second SIM; determining an offset adjustment to avoid a collisionbetween the SRS and the paging messages; sending a request to thenetwork associated with the first SIM to adjust the timing offsetaccording to the offset adjustment; and receiving an offset changeconfiguration from the network associated with the first SIM.

In an additional aspect of the disclosure, a user equipment (UE)includes: a first subscriber identity module (SIM) and a second SIM;means for operating the first SIM in an active-mode and operating thesecond SIM in an idle mode; means for generating a request toreconfigure a timing offset of a sounding reference signal (SRS)associated with the first SIM, including calculating a number of slotsfor adjusting the timing offset to avoid collision with paging decodeand signal measurement associated with the second SIM; means forreceiving configuration information from a network serving the firstSIM, the configuration information adjusting the timing offset inaccordance with the request; and means for transmitting the SRSaccording to the configuration information.

In an additional aspect of the disclosure, a non-transitorycomputer-readable medium having program code recorded thereon forwireless communication by a UE, the program code includes: for anactive-mode subscriber identity module (SIM) of the UE; code forperforming a radio frequency (RF) tune away to accommodate decodingpaging signals and received signal measurement for an idle-mode SIM ofthe UE, wherein the RF tune away collides with an SRS occurrence; codefor generating a request for adjustment of the timing offset to avoidcollision of the RF tune away and the SRS occurrence; code fortransmitting the request for adjustment to a network serving theactive-mode SIM; and code for adjusting the timing offset in response toreceipt of configuration information from the network serving theactive-mode SIM.

In an additional aspect of the disclosure, a UE includes a firstsubscriber identity module (SIM) associated with a first serviceprovider subscription and a second SIM associated with a second serviceprovider subscription; a modem configured to interface with a basestation; and a processor configured to interface with the modem and toaccess the first SIM and the second SIM, wherein the modem is furtherconfigured to: operate in a Dual SIM Dual Standby (DSDS) mode in whichthe first SIM is in an active-mode and the second SIM is in an idlemode; transmitting a sounding reference signal (SRS) from acommunication port of the UE, wherein the SRS has a timing offsetassigned by a network associated with the first SIM; performing signalmeasurement with respect to a signal received from a network associatedwith a second SIM; determining an offset adjustment to avoid a collisionbetween the SRS and the signal measurement; sending a request to thenetwork associated with the first SIM to adjust the timing offsetaccording to the offset adjustment; and receiving an offset changeconfiguration from the network associated with the first SIM.

Other aspects, features, and embodiments will become apparent to thoseof ordinary skill in the art, upon reviewing the following descriptionof specific, exemplary aspects in conjunction with the accompanyingfigures. While features may be discussed relative to certain aspects andfigures below, all aspects can include one or more of the advantageousfeatures discussed herein. In other words, while one or more aspects maybe discussed as having certain advantageous features, one or more ofsuch features may also be used in accordance with the various aspectsdiscussed herein. In similar fashion, while exemplary aspects may bediscussed below as device, system, or method aspects it should beunderstood that such exemplary aspects can be implemented in variousdevices, systems, and methods.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication network according to someaspects of the present disclosure.

FIG. 2 illustrates a communication scenario utilizing multiplesubscriptions according to some aspects of the present disclosure.

FIG. 3 is a block diagram of a hardware architecture of a UE, such asthe UEs of FIGS. 1-2 , according to some aspects of the presentdisclosure.

FIGS. 4-5 are example timelines for transmitting and receiving in amulti-SIM device, according to some aspects of the disclosure.

FIG. 6 is a diagram of an example method for adjusting a timing offsetof a sounding reference signal (SRS), according to some aspects of thepresent disclosure.

FIG. 7 illustrates a block diagram of a user equipment (UE) according tosome aspects of the present disclosure.

FIG. 8 illustrates a block diagram of a base station (BS) according tosome aspects of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below, in connection with theappended drawings, is intended as a description of variousconfigurations and is not intended to represent the only configurationsin which the concepts described herein may be practiced. The detaileddescription includes specific details for the purpose of providing athorough understanding of the various concepts. However, it will beapparent to those skilled in the art that these concepts may bepracticed without these specific details. In some aspects, well-knownstructures and components are shown in block diagram form in order toavoid obscuring such concepts.

This disclosure relates generally to wireless communications systems,also referred to as wireless communications networks. In variousaspects, the techniques and apparatus may be used for wirelesscommunication networks such as code division multiple access (CDMA)networks, time division multiple access (TDMA) networks, frequencydivision multiple access (FDMA) networks, orthogonal FDMA (OFDMA)networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GlobalSystem for Mobile Communications (GSM) networks, 5^(th) Generation (5G)or new radio (NR) networks, as well as other communications networks. Asdescribed herein, the terms “networks” and “systems” may be usedinterchangeably.

An OFDMA network may implement a radio technology such as evolved UTRA(E-UTRA), Institute of Electrical and Electronics Engineers (IEEE)802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA,and GSM are part of universal mobile telecommunication system (UMTS). Inparticular, long term evolution (LTE) is a release of UMTS that usesE-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documentsprovided from an organization named “3rd Generation Partnership Project”(3GPP), and cdma2000 is described in documents from an organizationnamed “3rd Generation Partnership Project 2” (3GPP2). These variousradio technologies and standards are known or are being developed. Forexample, the 3rd Generation Partnership Project (3GPP) is acollaboration between groups of telecommunications associations thataims to define a globally applicable third generation (3G) mobile phonespecification. 3GPP long term evolution (LTE) is a 3GPP project whichwas aimed at improving the UMTS mobile phone standard. The 3GPP maydefine specifications for the next generation of mobile networks, mobilesystems, and mobile devices. The present disclosure is concerned withthe evolution of wireless technologies from LTE, 4G, 5G, NR, and beyondwith shared access to wireless spectrum between networks using acollection of new and different radio access technologies or radio airinterfaces.

In particular, 5G networks contemplate diverse deployments, diversespectrum, and diverse services and devices that may be implemented usingan OFDM-based unified, air interface. To achieve these goals, furtherenhancements to LTE and LTE-A are considered in addition to developmentof the new radio technology for 5G NR networks. The 5G NR will becapable of scaling to provide coverage (1) to a massive Internet ofthings (IoTs) with a ULtra-high density (e.g., ˜1M nodes/km²), ultra-lowcomplexity (e.g., ˜10s of bits/sec), ultra-low energy (e.g., —10+ yearsof battery life), and deep coverage with the capability to reachchallenging locations; (2) including control with strong security tosafeguard sensitive personal, financial, or classified information,ultra-high reliability (e.g., ˜99.9999% reliability), ultra-low latency(e.g., ˜1 ms), and users with wide ranges of mobility or lack thereof;and (3) with enhanced mobile broadband including extreme high capacity(e.g., ˜10 Tbps/km²), extreme data rates (e.g., multi-Gbps rate, 100+Mbps user experienced rates), and deep awareness with advanced discoveryand optimizations.

A 5G NR system may be implemented to use optimized OFDM-based waveformswith scalable numerology and transmission time interval (TTI); having acommon, flexible framework to efficiently multiplex services andfeatures with a dynamic, low-latency time division duplex(TDD)/frequency division duplex (FDD) design; and with advanced wirelesstechnologies, such as massive multiple input, multiple output (MIMO),robust millimeter wave (mmWave) transmissions, advanced channel coding,and device-centric mobility. Scalability of the numerology in 5G NR,with scaling of subcarrier spacing, may efficiently address operatingdiverse services across diverse spectrum and diverse deployments. Forexample, in various outdoor and macro coverage deployments of less than3 GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz,for example over 5, 10, 20 MHz, and the like bandwidth (BW). For othervarious outdoor and small cell coverage deployments of TDD greater than3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz BW. Forother various indoor wideband implementations, using a TDD over theunlicensed portion of the 5 GHz band, the subcarrier spacing may occurwith 60 kHz over a 160 MHz BW. Finally, for various deploymentstransmitting with mmWave components at a TDD of 28 GHz, subcarrierspacing may occur with 120 kHz over a 500 MHz BW. In certain aspects,frequency bands for 5G NR are separated into two different frequencyranges, a frequency range one (FR1) and a frequency range two (FR2). FR1bands include frequency bands at 7 GHz or lower (e.g., between about 410MHz to about 7125 MHz). FR2 bands include frequency bands in mmWaveranges between about 24.25 GHz and about 52.6 GHz. The mmWave bands mayhave a shorter range, but a higher bandwidth than the FR1 bands.Additionally, 5G NR may support different sets of subcarrier spacing fordifferent frequency ranges.

The scalable numerology of the 5G NR facilitates scalable TTI fordiverse latency and quality of service (QoS) requirements. For example,shorter TTI may be used for low latency and high reliability, whilelonger TTI may be used for higher spectral efficiency. The efficientmultiplexing of long and short TTIs to allow transmissions to start onsymbol boundaries. 5G NR also contemplates a self-contained integratedsubframe design with UL/downlink scheduling information, data, andacknowledgement in the same subframe. The self-contained integratedsubframe supports communications in unlicensed or contention-basedshared spectrum, adaptive UL/downlink that may be flexibly configured ona per-cell basis to dynamically switch between UL and downlink to meetthe current traffic needs.

Various other aspects and features of the disclosure are furtherdescribed below. It should be apparent that the teachings herein may beembodied in a wide variety of forms and that any specific structure,function, or both being disclosed herein is merely representative andnot limiting. Based on the teachings herein one of an ordinary level ofskill in the art should appreciate that an aspect disclosed herein maybe implemented independently of any other aspects and that two or moreof these aspects may be combined in various ways. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, such an apparatusmay be implemented or such a method may be practiced using otherstructure, functionality, or structure and functionality in addition toor other than one or more of the aspects set forth herein. For example,a method may be implemented as part of a system, device, apparatus,and/or as instructions stored on a computer readable medium forexecution on a processor or computer. Furthermore, an aspect maycomprise at least one element of a claim.

In certain aspects, a wireless communication device or UE is a multipleSIM (MultiSim) device capable of utilizing multiple subscriptions forcommunication with one or more networks. For instance, the UE mayinclude two SIMS, a first SIM for a first subscription and a second SIMfor a second subscription. In some instances, the first and secondsubscriptions may be provided by the same operator. For example, thefirst subscription and the second subscription may correspond todifferent user accounts and/or services on the same operator network. Inother instances, the first and second subscriptions may be provided bydifferent operators. In any case, in certain scenarios, the UE maycommunicate using the first subscription and/or the second subscription.In some instances, the UE may operate in a dual-SIM dual-standby (DSDS)mode, where both subscriptions can be on standby (in an idle mode)waiting to begin communications. However, when a communication ornetwork connection is established on one SIM (e.g., the firstsubscription), the other SIM (e.g., the second subscription) is nolonger active. That is, one SIM may be active at a given time. The DSDSmode may be suitable for UEs that are equipped with a single transceiverand/or radio frequency (RF) chain which can either be utilized by thefirst subscription or the second subscription. In other instances, theUE may operate in a dual-SIM dual-active (DSDA) mode, where the UE maysimultaneously connect to the same network or different networks via thefirst SIM and the second SIM. To operate in the DSDA mode, the UE mayhave separate transceiver and/or RF chains or resources for the firstSIM and the second SIM. In the present disclosure, an operation orcommunication performed via a SIM may refer to an operation orcommunication performed for a wireless service subscription associatedwith the SIM (where the subscription information for the wirelessservice is stored).

For a multi-SIM device, one of the SIMS/subscriptions carries theinternet data traffic, and it is referred to as the default datasubscription (DDS) The other subscription—nDDS—is mainly used for voiceand short message service (SMS). The user chooses which subscription isthe DDS, and the user may change the DDS through a user interface (UI)of the UE.

For a multi-SIM device in DSDS mode, there may be periodic sharing ofthe UE's radio frequency (RF) resources between the two subscriptionsfor signal transmission on one subscription and decoding pages andperforming measurements in idle mode on the other subscription. Suchperiodic sharing may result in undesirable loss of downlink throughputin some instances, as described below.

Sounding reference signal (SRS) periodicity can vary from 10 ms to 160ms as configured by the network in some examples. If the periodicity ofSRS is 80 ms, until the time another SRS occasion falls, the network maynot be able to assess the condition of the UE receive ports for another80 ms. Due to sharing of the RF resources to the other subscription, SRStransmission from a first subscription (e.g., the DDS) may be suspendedwhile the RF resources tune away for page decode and measurement for theother subscription (e.g., the nDDS). If the SRS occasion falls duringthe tune away duration, there may be no transmission of SRS for a givenreceive (RX) port from the UE side. The network may then penalize theDDS in terms of downlink (DL) modulation and coding scheme (MCS) andresource blocks (RBs) for not receiving the SRS at the expected occasionresulting in the throughput degradation.

In fact, some network operators are aggressive in penalizing the UE dueto SRS suspension. One operator in particular takes around 200 ms torecover to the same MCS which was prior to the opening of the tune awaygap corresponding to a missing SRS. If the periodicity of the pagedecode on the nDDS is as low as 320 ms, then for more than 75% of thetime, the DDS may be served with lesser MCS and RBs, resulting in DLthroughput degradation of about ˜30% when compared to a single SIMdevice.

In some implementations, a UE may detect that an SRS occasion of a firstsubscription is in collision with a periodic gap associated with pagedecode and measurement of a second subscription. Or put another way, theUE may detect that the SRS occasion falls within a tune away timecorresponding to page decode and measurement. The UE may then indicateto the network to change an offset of the SRS occasion.

Continuing with the example, the network may receive the indication fromthe UE and then change the SRS offset in a subsequent radio resourcecontrol (RRC) configuration message. The new SRS offset timing may beselected so that the SRS occasion does not fall inside the tune awayperiod of the second subscription. In one example, the UE may send theSRS timing offset change indication in a media access control (MAC)control element (CE). While this example refers to an RRC configurationmessage and a MAC CE indication, the scope of implementations mayinclude any appropriate message or element to implement an SRS timingoffset adjustment.

Furthermore, various implementations the UE may calculate a change inthe timing offset based on a location of the SRS occasion within thetune away duration. In one example, the SRS occasion may be postponed orpre-poned as appropriate and according to a numerology used by the DDS.

Various implementations may include advantages. For instance,implementations providing for SRS offset timing adjustment mayexperience greater DL throughput to the DDS compared to a multi-SIMdevice that is unable to request an SRS offset timing adjustment. Thegreater DL throughput may lead to more efficient operation of the DDS aswell as greater user satisfaction.

FIG. 1 illustrates a wireless communication network 100 according tosome aspects of the present disclosure. The network 100 may be a 5Gnetwork. The network 100 includes a number of base stations (BSs) 105(individually labeled as 105 a, 105 b, 105 c, 105 d, 105 e, and 105 f)and other network entities. ABS 105 may be a station that communicateswith UEs 115 (individually labeled as 115 a, 115 b, 115 c, 115 d, 115 e,115 f, 115 g, 115 h, and 115 k) and may also be referred to as anevolved node B (eNB), a next generation eNB (gNB), an access point, andthe like. Each BS 105 may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to thisparticular geographic coverage area of a BS 105 and/or a BS subsystemserving the coverage area, depending on the context in which the term isused.

ABS 105 may provide communication coverage for a macro cell or a smallcell, such as a pico cell or a femto cell, and/or other types of cell. Amacro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEswith service subscriptions with the network provider. A small cell, suchas a pico cell, would generally cover a relatively smaller geographicarea and may allow unrestricted access by UEs with service subscriptionswith the network provider. A small cell, such as a femto cell, wouldalso generally cover a relatively small geographic area (e.g., a home)and, in addition to unrestricted access, may also provide restrictedaccess by UEs having an association with the femto cell (e.g., UEs in aclosed subscriber group (CSG), UEs for users in the home, and the like).A BS for a macro cell may be referred to as a macro BS. A BS for a smallcell may be referred to as a small cell BS, a pico BS, a femto BS or ahome BS. In the example shown in FIG. 1 , the BSs 105 d and 105 e may beregular macro BSs, while the BSs 105 a-105 c may be macro BSs enabledwith one of three dimension (3D), full dimension (FD), or massive MIMO.The BSs 105 a-105 c may take advantage of their higher dimension MIMOcapabilities to exploit 3D beamforming in both elevation and azimuthbeamforming to increase coverage and capacity. The BS 105 f may be asmall cell BS which may be a home node or portable access point. A BS105 may support one or multiple (e.g., two, three, four, and the like)cells.

The network 100 may support synchronous or asynchronous operation. Forsynchronous operation, the BSs may have similar frame timing, andtransmissions from different BSs may be approximately aligned in time.For asynchronous operation, the BSs may have different frame timing, andtransmissions from different BSs may not be aligned in time.

The UEs 115 are dispersed throughout the wireless network 100, and eachUE 115 may be stationary or mobile. A UE 115 may also be referred to asa terminal, a mobile station, a subscriber unit, a station, or the like.A UE 115 may be a cellular phone, a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, atablet computer, a laptop computer, a cordless phone, a wireless localloop (WLL) station, or the like. In one aspect, a UE 115 may be a devicethat includes a Universal Integrated Circuit Card (UICC). In anotheraspect, a UE may be a device that does not include a UICC. In someaspects, the UEs 115 that do not include UICCs may also be referred toas IoT devices or internet of everything (IoE) devices. The UEs 115a-115 d are examples of mobile smart phone-type devices accessingnetwork 100. A UE 115 may also be a machine specifically configured forconnected communication, including machine type communication (MTC),enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. The UEs 115e-115 h are examples of various machines configured for communicationthat access the network 100. The UEs 115 i-115 k are examples ofvehicles equipped with wireless communication devices configured forcommunication that access the network 100. A UE 115 may be able tocommunicate with any type of the BSs, whether macro BS, small cell, orthe like. In FIG. 1 , a lightning bolt (e.g., communication links)indicates wireless transmissions between a UE 115 and a serving BS 105,which is a BS designated to serve the UE 115 on the downlink (DL) and/oruplink (UL), desired transmission between BSs 105, backhaultransmissions between BSs, or sidelink transmissions between UEs 115.

In operation, the BSs 105 a-105 c may serve the UEs 115 a and 115 busing 3D beamforming and coordinated spatial techniques, such ascoordinated multipoint (CoMP) or multi-connectivity. The macro BS 105 dmay perform backhaul communications with the BSs 105 a-105 c, as well assmall cell, the BS 105 f. The macro BS 105 d may also transmitsmulticast services which are subscribed to and received by the UEs 115 cand 115 d. Such multicast services may include mobile television orstream video, or may include other services for providing communityinformation, such as weather emergencies or alerts, such as Amber alertsor gray alerts.

The BSs 105 may also communicate with a core network. The core networkmay provide user authentication, access authorization, tracking,Internet Protocol (IP) connectivity, and other access, routing, ormobility functions. At least some of the BSs 105 (e.g., which may be anexample of a gNB or an access node controller (ANC)) may interface withthe core network through backhaul links (e.g., NG-C, NG-U, etc.) and mayperform radio configuration and scheduling for communication with theUEs 115. In various examples, the BSs 105 may communicate, eitherdirectly or indirectly (e.g., through core network), with each otherover backhaul links (e.g., X1, X2, etc.), which may be wired or wirelesscommunication links.

The network 100 may also support communications with ultra-reliable andredundant links for devices, such as the UE 115 e, which may beairborne. Redundant communication links with the UE 115 e may includelinks from the macro BSs 105 d and 105 e, as well as links from thesmall cell BS 105 f. Other machine type devices, such as the UE 115 f(e.g., a thermometer), the UE 115 g (e.g., smart meter), and UE 115 h(e.g., wearable device) may communicate through the network 100 eitherdirectly with BSs, such as the small cell BS 105 f, and the macro BS 105e, or in multi-action-size configurations by communicating with anotheruser device which relays its information to the network, such as the UE115 f communicating temperature measurement information to the smartmeter, the UE 115 g, which is then reported to the network through thesmall cell BS 105 f. The network 100 may also provide additional networkefficiency through dynamic, low-latency TDD/FDD communications, such asV2V, V2X, C-V2X communications between a UE 115 i, 115 j, or 115 k andother UEs 115, and/or vehicle-to-infrastructure (V2I) communicationsbetween a UE 115 i, 115 j, or 115 k and a BS 105.

In some implementations, the network 100 utilizes OFDM-based waveformsfor communications. An OFDM-based system may partition the system BWinto multiple (K) orthogonal subcarriers, which are also commonlyreferred to as subcarriers, tones, bins, or the like. Each subcarriermay be modulated with data. In some aspects, the subcarrier spacingbetween adjacent subcarriers may be fixed, and the total number ofsubcarriers (K) may be dependent on the system BW. The system BW mayalso be partitioned into subbands. In other aspects, the subcarrierspacing and/or the duration of TTIs may be scalable.

In some aspects, the BSs 105 can assign or schedule transmissionresources (e.g., in the form of time-frequency resource blocks (RB)) fordownlink (DL) and uplink (UL) transmissions in the network 100. DLrefers to the transmission direction from a BS 105 to a UE 115, whereasUL refers to the transmission direction from a UE 115 to a BS 105. Thecommunication can be in the form of radio frames. A radio frame may bedivided into a plurality of subframes or slots, for example, about 10.Each slot may be further divided into mini-slots. In a FDD mode,simultaneous UL and DL transmissions may occur in different frequencybands. For example, each subframe includes a UL subframe in a ULfrequency band and a DL subframe in a DL frequency band. In a TDD mode,UL and DL transmissions occur at different time periods using the samefrequency band. For example, a subset of the subframes (e.g., DLsubframes) in a radio frame may be used for DL transmissions and anothersubset of the subframes (e.g., UL subframes) in the radio frame may beused for UL transmissions.

The DL subframes and the UL subframes can be further divided intoseveral regions. For example, each DL or UL subframe may havepre-defined regions for transmissions of reference signals, controlinformation, and data. Reference signals are predetermined signals thatfacilitate the communications between the BSs 105 and the UEs 115. Forexample, a reference signal can have a particular pilot pattern orstructure, where pilot tones may span across an operational BW orfrequency band, each positioned at a pre-defined time and a pre-definedfrequency. For example, a BS 105 may transmit cell specific referencesignals (CRSs) and/or channel state information—reference signals(CSI-RSs) to enable a UE 115 to estimate a DL channel. Similarly, a UE115 may transmit sounding reference signals (SRSs) to enable a BS 105 toestimate a UL channel. Control information may include resourceassignments and protocol controls. Data may include protocol data and/oroperational data. In some aspects, the BSs 105 and the UEs 115 maycommunicate using self-contained subframes. A self-contained subframemay include a portion for DL communication and a portion for ULcommunication. A self-contained subframe can be DL-centric orUL-centric. A DL-centric subframe may include a longer duration for DLcommunication than for UL communication. A UL-centric subframe mayinclude a longer duration for UL communication than for ULcommunication.

In some aspects, the network 100 may be an NR network deployed over alicensed spectrum. The BSs 105 can transmit synchronization signals(e.g., including a primary synchronization signal (PSS) and a secondarysynchronization signal (SSS)) in the network 100 to facilitatesynchronization. The BSs 105 can broadcast system information associatedwith the network 100 (e.g., including a master information block (MIB),remaining system information (RMSI), and other system information (OSI))to facilitate initial network access. In some aspects, the BSs 105 maybroadcast the PSS, the SSS, and/or the MIB in the form ofsynchronization signal block (SSBs) and may broadcast the RMSI and/orthe OSI over a physical downlink shared channel (PDSCH). The MIB may betransmitted over a physical broadcast channel (PBCH).

In some aspects, a UE 115 attempting to access the network 100 mayperform an initial cell search by detecting a PSS from a BS 105. The PSSmay enable synchronization of period timing and may indicate a physicallayer identity value. The UE 115 may then receive a SSS. The SSS mayenable radio frame synchronization, and may provide a cell identityvalue, which may be combined with the physical layer identity value toidentify the cell. The PSS and the SSS may be located in a centralportion of a carrier or any suitable frequencies within the carrier.

After receiving the PSS and SSS, the UE 115 may receive a MIB. The MIBmay include system information for initial network access and schedulinginformation for RMSI and/or OSI. After decoding the MIB, the UE 115 mayreceive RMSI and/or OSI. The RMSI and/or OSI may include radio resourcecontrol (RRC) information related to random access channel (RACH)procedures, paging, control resource set (CORESET) for physical downlinkcontrol channel (PDCCH) monitoring, physical UL control channel (PUCCH),physical UL shared channel (PUSCH), power control, and SRS.

After obtaining the MIB, the RMSI and/or the OSI, the UE 115 can performa random access procedure to establish a connection with the BS 105. Insome examples, the random access procedure may be a four-step randomaccess procedure. For example, the UE 115 may transmit a random accesspreamble and the BS 105 may respond with a random access response. Therandom access response (RAR) may include a detected random accesspreamble identifier (ID) corresponding to the random access preamble,timing advance (TA) information, a UL grant, a temporary cell-radionetwork temporary identifier (C-RNTI), and/or a backoff indicator. Uponreceiving the random access response, the UE 115 may transmit aconnection request to the BS 105 and the BS 105 may respond with aconnection response. The connection response may indicate a contentionresolution. In some examples, the random access preamble, the RAR, theconnection request, and the connection response can be referred to asmessage 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4(MSG4), respectively. In some examples, the random access procedure maybe a two-step random access procedure, where the UE 115 may transmit arandom access preamble and a connection request in a single transmissionand the BS 105 may respond by transmitting a random access response anda connection response in a single transmission.

After establishing a connection, the UE 115 and the BS 105 can enter anormal operation stage, where operational data may be exchanged. Forexample, the BS 105 may schedule the UE 115 for UL and/or DLcommunications. The BS 105 may transmit UL and/or DL scheduling grantsto the UE 115 via a PDCCH. The scheduling grants may be transmitted inthe form of DL control information (DCI). The BS 105 may transmit a DLcommunication signal (e.g., carrying data) to the UE 115 via a PDSCHaccording to a DL scheduling grant. The UE 115 may transmit a ULcommunication signal to the BS 105 via a PUSCH and/or PUCCH according toa UL scheduling grant. The connection may be referred to as an RRCconnection. When the UE 115 is actively exchanging data with the BS 105,the UE 115 is in an RRC connected state.

In an example, after establishing a connection with the BS 105, the UE115 may initiate an initial network attachment procedure with thenetwork 100. The BS 105 may coordinate with various network entities orfifth generation core (5GC) entities, such as an access and mobilityfunction (AMF), a serving gateway (SGW), and/or a packet data networkgateway (PGW), to complete the network attachment procedure. Forexample, the BS 105 may coordinate with the network entities in the 5GCto identify the UE, authenticate the UE, and/or authorize the UE forsending and/or receiving data in the network 100. In addition, the AMFmay assign the UE with a group of tracking areas (TAs). Once the networkattach procedure succeeds, a context is established for the UE 115 inthe AMF. After a successful attach to the network, the UE 115 can movearound the current TA. For tracking area update (TAU), the BS 105 mayrequest the UE 115 to update the network 100 with the UE 115's locationperiodically. Alternatively, the UE 115 may only report the UE 115'slocation to the network 100 when entering a new TA. The TAU allows thenetwork 100 to quickly locate the UE 115 and page the UE 115 uponreceiving an incoming data packet or call for the UE 115.

In some aspects, the BS 105 may communicate with a UE 115 using HARQtechniques to improve communication reliability, for example, to providea URLLC service. The BS 105 may schedule a UE 115 for a PDSCHcommunication by transmitting a DL grant in a PDCCH. The BS 105 maytransmit a DL data packet to the UE 115 according to the schedule in thePDSCH. The DL data packet may be transmitted in the form of a transportblock (TB). If the UE 115 receives the DL data packet successfully, theUE 115 may transmit a HARQ ACK to the BS 105. Conversely, if the UE 115fails to receive the DL transmission successfully, the UE 115 maytransmit a HARQ NACK to the BS 105. Upon receiving a HARQ NACK from theUE 115, the BS 105 may retransmit the DL data packet to the UE 115. Theretransmission may include the same coded version of DL data as theinitial transmission. Alternatively, the retransmission may include adifferent coded version of the DL data than the initial transmission.The UE 115 may apply soft combining to combine the encoded data receivedfrom the initial transmission and the retransmission for decoding. TheBS 105 and the UE 115 may also apply HARQ for UL communications usingsubstantially similar mechanisms as the DL HARQ.

In some aspects, the network 100 may operate over a system BW or acomponent carrier (CC) BW. The network 100 may partition the system BWinto multiple BWPs (e.g., portions). A BS 105 may dynamically assign aUE 115 to operate over a certain BWP (e.g., a certain portion of thesystem BW). The assigned BWP may be referred to as the active BWP. TheUE 115 may monitor the active BWP for signaling information from the BS105. The BS 105 may schedule the UE 115 for UL or DL communications inthe active BWP. In some aspects, a BS 105 may assign a pair of BWPswithin the CC to a UE 115 for UL and DL communications. For example, theBWP pair may include one BWP for UL communications and one BWP for DLcommunications.

In some aspects, a UE 115 may be capable of utilizing multiple SIMS andmay operate in a DSDS mode and may manage SRS timing offset adjustment,as explained in more detail below.

FIG. 2 illustrates a communication scenario 200 that utilizes multiplesubscriptions according to some aspects of the present disclosure. Thecommunication scenario 200 may correspond to a communication scenarioamong BSs 105 and or UEs 115 in the network 100. For simplicity, FIG. 2illustrates two BSs 205 (shown as 205 a and 205 b) and one UE 215, but agreater number of UEs 215 (e.g., the about 3, 4, 3, 6, 7, 8, 9, 10, ormore) and/or BSs 205 (e.g., the about 3, 4 or more) may be supported.The BS 205 and the UEs 215 may be similar to the BSs 105 and the UEs115, respectively.

In the scenario 200, the UE 215 is capable of utilizing multiple SIMS(e.g., SIM cards) for communication with one or more networks. Forsimplicity, FIG. 2 illustrates the UE 215 including two SIMS 210 (shownas SIM A 210 a and SIM B 210 b), but the UE 215 may include more thantwo SIMS (e.g., about 3, 4 or more). In some aspects, each SIM 210 mayinclude integrated circuits and/or memory configured to storeinformation used for accessing a network, for example, to authenticateand identify the UE 215 as a subscriber of the network. Some examples ofinformation stored at the SIM A 210 a and/or SIM B 210 b may include,but not limited to, a subscriber identity such as an internationalmobile subscriber identity (IMSI) and/or information and/or key used toidentify and authenticate the UE 215 in a certain provider network. Asan example, the UE 215 may subscribe to a first operator and a secondoperator. That is, the UE 215 may have a first subscription 212 a (shownas SUB A) with the first operator and a second subscription 212 b (shownas SUB B) with the second operator. Accordingly, the SIM A 210 a maystore or maintain information for accessing a network of the firstoperator based on the first subscription 212 a, and the SIM B 210 b maystore information for accessing a network of the second operator basedon the second subscription 212 b. In some instances, the first operatorand the second operator may correspond to the same operator. Forexample, the first subscription 212 a and the second subscription 212 bmay correspond to different user accounts and/or services subscribedwith the same operator. In other instances, the first operator may bedifferent from the second operator.

In operation, the UE 215 may communicate with a BS 205 a (operated bythe first operator) using the SIM A 210 a via a radio link 202 a.Further, the UE 215 may communicate with a BS 205 b (operated by thesecond operator) using the SIM B 210 b via a radio link 202 b. In someaspects, the UE 215 may use the same radio access technology (e.g., NRor NR-U) for communication with the BS 205 a and the BS 205 b. In otheraspects, the UE 215 may use one radio access technology (e.g., NR orNR-U) for communication with the BS 205 a and another radio accesstechnology (e.g., LTE) for communication with the BS 205 b. AlthoughFIG. 2 illustrates the UE 215 communicates with different BSs 205 usingthe SIM A 210 a and the SIM B 210 b, it should be understood that inother examples the UE 215 may communicate with the same BS. Forinstance, the UE 215 may communicate with the same BS 205 a for thefirst subscription 212 a via the SIM A 210 a and for the secondsubscription 212 b via the SIM B 210 b.

In some aspects, the UE 215 may operate in a DSDS mode, where both SIMs210 a and 210 b can be on standby (in an idle mode) waiting to begincommunications. When a communication is established on one SIM (e.g.,the SIM A 210 a), the other SIM (e.g., the SIM B 210 b) is no longeractive. That is, one SIM may be active at a given time. For instance,both SIMS 210 may share a single transceiver and/or RF chain at the UE215 for communications with corresponding network(s).

In some aspects, the radio link 202 a between the UE 215 and the BS 205a and the radio link 202 b between the UE 215 and the BS 205 b may beover orthogonal bands such as FR1/FR2 or low band/high band FR1. Ofcourse, any combination of radio links 202 is possible, and the radiolinks may even take place using different radio access technologies. Forinstance, radio link 202 a may carry communications according to 5Gprotocols, whereas radio link 202 b may carry communications accordingto LTE protocols.

Furthermore, UE 215 may manage SRS timing offset adjustments, accordingto the techniques described below with respect to FIGS. 3-6 .

FIG. 3 illustrates an example hardware architecture for RF chains, whichmay be implemented within UE 115 (FIG. 1 ), UE 215 (FIG. 2 ), or UE 700(FIG. 7 ). In this exemplary design, the hardware architecture includesa transceiver 320 coupled to a first antenna 310, a transceiver 322coupled to a second antenna 312, and a data processor/controller 380.Transceiver 320 includes multiple (K) receivers 330 pa to 330 pk andmultiple (K) transmitters 350 pa to 350 pk to support multiple frequencybands, multiple radio technologies, carrier aggregation, etc.Transceiver 322 includes L receivers 330 sa to 330 s 1 and Ltransmitters 350 sa to 350 s 1 to support multiple frequency bands,multiple radio technologies, carrier aggregation, receive diversity,multiple-input multiple-output (MIMO) transmission from multipletransmit antennas to multiple receive antennas, etc.

In the exemplary design shown in FIG. 3 , each receiver 330 includes anLNA 340 and receive circuits 342. For data reception, antenna 310receives signals from base stations and/or other transmitter stationsand provides a received RF signal, which may be routed through anantenna interface circuit 324 and presented as an input RF signal to aselected receiver. Antenna interface circuit 324 may include switches,duplexers, transmit filters, receive filters, matching circuits, etc.The description below assumes that receiver 330 pa is the selectedreceiver, though the described operations apply equally well to any ofthe other receivers 330. Within receiver 330 pa, an LNA 340 pa amplifiesthe input RF signal and provides an output RF signal. Receive circuits342 pa downconvert the output RF signal from RF to baseband, amplify andfilter the downconverted signal, and provide an analog input signal todata processor 380. Receive circuits 342 pa may include mixers, filters,amplifiers, matching circuits, an oscillator, a local oscillator (LO)generator, a phase locked loop (PLL), etc. Each remaining receiver 330in transceivers 320 and 322 may operate in a similar manner as receiver330 pa.

In the exemplary design shown in FIG. 3 , each transmitter 350 includestransmit circuits 352 and a power amplifier (PA) 354. For datatransmission, data processor 380 processes (e.g., encodes and modulates)data to be transmitted and provides an analog output signal to aselected transmitter. The description below assumes that transmitter 350pa is the selected transmitter, though the described operations applyequally well to any of the other transmitters 350. Within transmitter350 pa, transmit circuits 352 pa amplify, filter, and upconvert theanalog output signal from baseband to RF and provide a modulated RFsignal. Transmit circuits 352 pa may include amplifiers, filters,mixers, matching circuits, an oscillator, an LO generator, a PLL, etc. APA 354 pa receives and amplifies the modulated RF signal and provides atransmit RF signal having the proper output power level. The transmit RFsignal may be routed through antenna interface circuit 324 andtransmitted via antenna 310. Each remaining transmitter 350 intransceivers 320 and 322 may operate in a similar manner as transmitter350 pa.

FIG. 3 shows an exemplary design of receiver 330 and transmitter 350. Areceiver and a transmitter may also include other circuits not shown inFIG. 3 , such as filters, matching circuits, etc. All or a portion oftransceivers 320 and 322 may be implemented on one or more analog (ICs,RF ICs (RFICs), mixed-signal ICs, etc. For example, LNAs 340 and receivecircuits 342 within transceivers 320 and 322 may be implemented onmultiple IC chips or on the same IC chip. The circuits in transceivers320 and 322 may also be implemented in other manners.

Data processor/controller 380 may perform various functions for wirelessdevice 110. For example, data processor 380 may perform processing fordata being received via receivers 330 and data being transmitted viatransmitters 350. Controller 380 may control the operation of thevarious circuits within transceivers 320 and 322. A memory 382 may storeprogram codes and data for data processor/controller 380. Dataprocessor/controller 380 may be implemented on one or more applicationspecific integrated circuits (ASICs) and/or other ICs.

Controller 380 may be in communication with one or more SIMS to provideDSDA operation in which one SIM may be transmitting and receiving data,while the other SIM may be in idle mode. The controller 380 may executesoftware logic that assigns one of the transceivers 320, 322 to aparticular SIM and the other one of the transceivers to the other SIM ina dual SIM implementation. In another example, the controller 380 mayassign both transceivers 320, 322 to both SIMS, thereby allowing bothSIMS two employ multi-antenna operations, such as beam forming and thelike. In one example implementation, one of the SIMS is active, whereasthe other SIM is in idle mode. During an SRS occurrence, the first SIM(e.g., the DDS) may use the transmitting portions of either or both ofthe transceivers 320, 322 to transmit an SRS. The network may then usereceived SRS to estimate the DL channel for the RX ports (e.g.,antenna/transceiver pairs) of the UE.

However, the other SIM may periodically receive paging signals from itsnetwork. In doing so, the other SIM may use RF resources (e.g., antennas310, 312, interface circuits 324, 326, and various filters, mixers,oscillators, and processing circuits not shown) and require those RFresources to be “tuned away” from the SRS and tuned instead toward thepaging signals. That “tune away” time represents a duration in which theSRS may not be transmitted. Therefore, in various implementations, theprocessor 380 executes instructions to provide SRS offset timingadjustment, as described in more detail below with respect to FIGS. 4-5.

FIG. 4 is an illustration of an example timeline 400, according to oneimplementation. The timeline 400 may represent the operation of a UE,such as UE 115 (FIG. 1 ), UE 215 (FIG. 2 ), or UE 700 (FIG. 7 ).

Timeline 400 includes a multitude of SRS occasions, exemplified by thedots 401-405. SRS transmission 401 is successful, as is SRS transmission403. However, SRS occasion 402 falls within a tune away duration 410.Tune away duration 410 was explained above with respect to FIG. 3 and,in short, it refers to a time in which an idle mode SIM in the multi-SIMdevice has control of RF hardware in order to perform the page decodeand other measurements. Such RF hardware is unavailable to theactive-mode SIM during tune away period 410. Tune away duration 410 isshown as extending from a time when the tune away starts to a time whenthe tune away ends.

Similarly, SRS occasions 404, 405 fall within tune away durations inwhich the active-mode SIM would not be able to transmit an SRS.Nevertheless, SRS occasions 401, 403 and others not within tune awaydurations would include transmitted SRS. The network may then use thetransmitted SRS to estimate the DL channel for the RX ports of the UE.

The SRS occasions 401-405 are configured by the network to have anoffset 420 from a reference slot as well as to have a particularperiodicity. For instance, the periodicity of the SRS occasions 401-405may be anywhere from 10 ms to 160 ms in some networks. The timingoffset, measured in slots, may be 32 to 64 slots in some networks, wherethat number of slots may correspond to different time amounts dependingon a numerology used by the active-mode SIM.

FIG. 5 is an illustration of an example timeline 500, according to oneimplementation. The timeline 500 may represent the operation of a UE,such as UE 115 (FIG. 1 ), UE 215 (FIG. 2 ), or UE 700 (FIG. 7 ). Infact, the timeline 500 represents an effect of a timing offsetadjustment performed by the UE to avoid SRS occasions colliding withtune away durations.

The UE, having recognized the collision illustrated by SRS occasion 402falling within tune away duration 410, may request a timing offsetadjustment from the network. For instance, the UE may calculate a timingoffset adjustment for the request.

An example tune away time seen in the field is 40 ms, though other tuneaway times are possible. The tune away time represents the time it takesfor one subscription to perform the page decode and measurements. Thetune away time is not something configured by the network or the UE;instead, the tune away time is usually a function of the software orhardware of the UE, and it is not readily changeable.

In one example, the calculated SRS offset range includes −x to x, so therange size can be up to 2x.

−x: left shift the SRS offset by 32*2*(μ+1) slots0: No change in offsetx: right shift the SRS offset by 32*2*(μ+1) slots, where μcorresponds tothe numerology mentioned in the below Table 1. The values forleft-shifting and right-shifting are for example only, and otherimplementations may use different values.

TABLE 1 μ Sub Carrier Spacing (kHz) Cyclic Prefix 0 15 Normal 1 30Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal

The calculation of the offset adjustment can be performed by the UEbased on the location of the SRS occasion within the tune away durationand based on the particular numerology (μ) used by the network that isserving the active-mode subscription. Assuming that the time of the tuneaway (the duration) is 40 ms, the UE may split that 40 ms in half. Ifthe missed SRS falls within the first 20 ms, then the UE may request toshift the SRS offset more than 20 ms before. In other words, pre-pone orshift to the left and use a negative value. If the missed SRS fallsafter the first 20 ms, then the UE may request to shift the SRS offsetto right shift the RS offset, in other words postpone the RS offset.

The offset range is measured in slots, and the slots are defined by thenumerology, including the subcarrier spacing (15 kHz, 30 kHz, 60 kHz,120 kHz, or 240 kHz). The slot duration may vary based on numerology.For the example, the subcarrier spacing of 15 kHz gives either a left orright shift of 64 ms, and in case of 30 kHz gives a left or right shiftof 32 ms. The scope of embodiments may be adapted for use with anynumerology and may be applied to both FR1 and FR2.

The calculation of the offset adjustment may be performed by the UE. TheUE may determine a number of slots to request for the offset. The UE maysend the offset adjustment request to the network using the MAC CE. Thenetwork may then choose to change the timing offset of the SRS or not—itis not mandatory. If the network accepts the change, then it may sendthe offset adjustment to the UE in a subsequent RRC configuration.

FIG. 5 shows the example timeline 500, which is subsequent to the UEreceiving a RRC configuration from the network to adjust the SRS timingoffset. Timeline 500 shows the same periodicity of the SRS as intimeline 400 (FIG. 4 ), but with a different offset 520 from a referenceor initial slot. As a result, the various SRS occasions, exemplified bythe dots 501-506, do not fall within the tune away durations (e.g.,duration 410). Therefore, each of the SRS occasions corresponds to anSRS transmit success. The network may then receive each of the SRStransmissions and assign an appropriate MCS and number of RBs for thedetected condition of the RX ports of the UE.

The timelines 400 and 500 are not drawn to scale, so it is understoodthat the tune away duration 410, and a timing offsets 420, 520 are forillustration only.

FIG. 6 is a flowchart of a method 600 to adjust an SRS timing offset toavoid a collision between SRS and paging and measurement in a multi-SIMsystem, according to some aspects of the present disclosure. The method600 may be performed by UE, such as UE 115 (FIG. 1 ), UE 215 (FIG. 2 ),or UE 700 (FIG. 7 ). As illustrated, the method 600 includes a number ofenumerated actions, but aspects of the method 600 may include additionalactions before, after, and in between the enumerated actions. In someaspects, one or more of the enumerated actions may be omitted orperformed in a different order.

At action 601, the UE operates in a DSDS mode in which a first SIM isdesignated as the DDS, and in which a second SIM is the nDDS. Further inthis example, the DDS is in active-mode, whereas the nDDS is in idlemode. The first SIM and the second SIM may be serviced by a same networkor different networks.

At action 602, the UE transmits an SRS from communication ports of theUE. Examples of communication ports include those shown in FIG. 3 , suchas the transceiver/antenna pair 310/320 and the transceiver/antenna pair312/322. The UE transmits the SRS from those communication ports, andthe SRS is received by the network associated with the first SIM throughone or more base stations.

The SRS has a timing offset assigned by the network. Example timingoffsets are shown in FIGS. 4 and 5 (items 420, 520).

At action 603, the UE receives a paging message or paging messages froma network that is associated with the second SIM. The paging messagesmay be received during a tune away time, such as the tune away time 410illustrated in FIGS. 4 and 5 . Action 603 may also include the UEperforming various measurements, such as for reference signal receivedpower (RSRP), received signal strength indicator (RSSI), signal andinterference to noise ratio (SINR), and the like. The tune away time isa time during which shared RF circuitry is unavailable to the first SIMwhile it is being used by the second SIM for page decode andmeasurement.

At action 604, the UE determines an offset adjustment to avoid acollision between the SRS and the paging messages and signalmeasurement. For instance, if the UE determines that an occurrence ofthe SRS falls within a first-in-time half of a tune away period of radiofrequency (RF) hardware shared by the first SIM and the second SIM, thenthe UE may then determine to pre-pone the SRS. Similarly, if the UEdetermines that an occurrence of the SRS falls within a second-in-timehalf of the tuna way period, then the UE may determine to postpone theSRS.

An example of calculating an SRS timing adjustment is given above withrespect to FIG. 5 . For instance, the UE may apply a function toleft-shift or right-shift the timing offset by a particular number ofslots dependent upon a numerology used by the first SIM. As noted above,slot duration made differ from numerology to numerology, so the offsetas measured in milliseconds may differ depending on the particularnumerology.

At action 605, the UE sends a request to the network associated with thefirst SIM. The request may indicate to the network to adjust the timingoffset according to the offset adjustment that was calculated at action604. In some examples, the request may be included in a MAC CE message,perhaps using a reserved field or any other appropriate field. The scopeof implementations is not limited to MAC CE only, as any appropriatesignaling, such as DCI, may be used in other examples.

At action 606, the UE receives an offset change configuration from thenetwork that is associated with the first SIM. For instance, the networkmay configure the timing offset using RRC or other appropriatesignaling. In this example, the network may determine whether to acceptor ignore the request from the UE. In the example of method 600, thenetwork has determined to accept the request from the network and hasgenerated and transmitted a RRC configuration to the UE, where the RRCconfiguration incorporates the offset adjustment.

At action 607, the UE transmits the SRS according to the offsetadjustment. In other words, the UE receives the RRC from the network,parses the RRC to process the information in the RRC, the informationincluding the timing adjustment. The UE then implements that timingadjustment and may continue using the new timing offset until it isreconfigured by yet another subsequent RRC.

In the example of method 600, action 602 may be similar to the SRStransmissions of FIG. 4 , where some SRS occasions may be blocked by atune away duration. Furthermore, the action 607 may be similar to theSRS transmissions of FIG. 5 , where the SRS occasions are not blocked bytune away durations.

The action 601-607 may be repeated as often as appropriate. Forinstance, as the UE moves from one base station to another base station,configurations may be changed, including a timing of paging receptionand a timing of SRS. Accordingly, the UE may adjust the SRS timingoffset as described above to avoid or at least reduce a number of SRSoccasions that are blocked by a tune away duration.

Various embodiments may provide advantages over prior systems. Forinstance, embodiments that can avoid or reduce a number of blocked SRSoccasions may also avoid or reduce the artificial throttling, via MCSand RB configuration, performed by some networks that assume anincreased block error rate when SRS occasions are blocked. As a result,those systems may increase throughput, thereby increasing data perbattery charge efficiency and data per time efficiency. Furthermore,such systems may also increase user satisfaction by having fasterdownload times.

FIG. 7 is a block diagram of an exemplary UE 700 according to someaspects of the present disclosure. The UE 700 may be a UE 115 or UE 215as discussed above in FIGS. 1-2 and may conform to the hardwarearchitecture described above with respect to FIG. 3 . As shown, the UE700 may include a processor 702, a memory 704, a MultiSim module 708, atransceiver 710 including a modem subsystem 712 and a radio frequency(RF) unit 714, and one or more antennas 716. These elements may becoupled with one another. The term “coupled” may refer to directly orindirectly coupled or connected to one or more intervening elements. Forinstance, these elements may be in direct or indirect communication witheach other, for example via one or more buses.

The processor 702 may include a central processing unit (CPU), a digitalsignal processor (DSP), an application specific integrated circuit(ASIC), a controller, a field programmable gate array (FPGA) device,another hardware device, a firmware device, or any combination thereofconfigured to perform the operations described herein. The processor 702may also be implemented as a combination of computing devices, e.g., acombination of a DSP and a microprocessor, a plurality ofmicroprocessors, one or more microprocessors in conjunction with a DSPcore, or any other such configuration.

The memory 704 may include a cache memory (e.g., a cache memory of theprocessor 702), random access memory (RAM), magnetoresistive RAM (MRAM),read-only memory (ROM), programmable read-only memory (PROM), erasableprogrammable read only memory (EPROM), electrically erasableprogrammable read only memory (EEPROM), flash memory, solid state memorydevice, hard disk drives, other forms of volatile and non-volatilememory, or a combination of different types of memory. In an aspect, thememory 704 includes a non-transitory computer-readable medium. Thememory 704 may store, or have recorded thereon, instructions 706. Theinstructions 706 may include instructions that, when executed by theprocessor 702, cause the processor 702 to perform the operationsdescribed herein with reference to a UE 115, 215 in connection withaspects of the present disclosure, for example, aspects of FIGS. 1-6 .Instructions 706 may also be referred to as code, which may include anytype of computer-readable statements.

The MultiSim module 708 may be implemented via hardware, software, orcombinations thereof. For example, the MultiSim module 708 may beimplemented as a processor, circuit, and/or instructions 706 stored inthe memory 704 and executed by the processor 702.

In some aspects, the MultiSim module 708 may include multiple SIMS orSIM cards (e.g., 2, 3, 4, or more) similar to the SIMS 210. Each SIM maybe configured to store information used for accessing a network, forexample, to authenticate and identify the UE 700 as a subscriber of thenetwork. Some examples of information stored on a SIM may include, butnot limited to, a subscriber identity such as an international mobilesubscriber identity (IMSI) and/or information and/or key used toidentify and authenticate the UE 700 in a certain provider network. Insome aspects, the UE 700 may have a first subscription on a first SIM ofthe multiple SIMS and a second subscription on a second SIM of themultiple SIMS. The first subscription may identify the UE 700 by a firstsubscriber identity, and the second subscription may identify the UE 700by a second subscriber identity.

In some embodiments, the functionality described above with respect toFIG. 6 may be included as logic within Multi-SIM module 708. Otherembodiments, the functionality may be included in another component,such as in computer readable code within instructions 706 in memory 704.

As shown, the transceiver 710 may include the modem subsystem 712 andthe RF unit 714. The transceiver 710 can be configured to communicatebi-directionally with other devices, such as the BSs 105 and 500. Themodem subsystem 712 may be configured to modulate and/or encode the datafrom the memory 704 and the MultiSim module 708 according to amodulation and coding scheme (MCS), e.g., a low-density parity check(LDPC) coding scheme, a turbo coding scheme, a convolutional codingscheme, a digital beamforming scheme, etc. The RF unit 714 may beconfigured to process (e.g., perform analog to digital conversion ordigital to analog conversion, etc.) modulated/encoded data (e.g., PUSCHdata, PUCCH UCI, MSG1, MSG3, etc.) or of transmissions originating fromanother source such as a UE 115, a BS 105, or an anchor. The RF unit 714may be further configured to perform analog beamforming in conjunctionwith digital beamforming. Although shown as integrated together intransceiver 710, the modem subsystem 712 and the RF unit 714 may beseparate devices that are coupled together at the UE 700 to enable theUE 700 to communicate with other devices.

The RF unit 714 may provide the modulated and/or processed data, e.g.data packets (or, more generally, data messages that may contain one ormore data packets and other information), to the antennas 716 fortransmission to one or more other devices. The antennas 716 may furtherreceive data messages transmitted from other devices. The antennas 716may provide the received data messages for processing and/ordemodulation at the transceiver 710. The transceiver 710 may provide thedemodulated and decoded data (e.g., RRC configurations, MIB, PDSCH dataand/or PDCCH DCIs, etc.) to the MultiSim module 708 for processing. Theantennas 716 may include multiple antennas of similar or differentdesigns in order to sustain multiple transmission links.

In an aspect, the UE 700 can include multiple transceivers 710implementing different RATs (e.g., NR and LTE). In an aspect, the UE 700can include a single transceiver 710 implementing multiple RATs (e.g.,NR and LTE). In an aspect, the transceiver 710 can include variouscomponents, where different combinations of components can implementdifferent RATs.

FIG. 8 is a block diagram of an exemplary BS 800 according to someaspects of the present disclosure. The BS 800 may be a BS 105 or a BS205 as discussed in FIGS. 1 and 2 . As shown, the BS 800 may include aprocessor 802, a memory 804, a communication module 808, a transceiver810 including a modem subsystem 812 and a RF unit 814, and one or moreantennas 816. These elements may be coupled with one another. The term“coupled” may refer to directly or indirectly coupled or connected toone or more intervening elements. For instance, these elements may be indirect or indirect communication with each other, for example via one ormore buses.

The processor 802 may have various features as a specific-typeprocessor. For example, these may include a CPU, a DSP, an ASIC, acontroller, a FPGA device, another hardware device, a firmware device,or any combination thereof configured to perform the operationsdescribed herein. The processor 802 may also be implemented as acombination of computing devices, e.g., a combination of a DSP and amicroprocessor, a plurality of microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration.

The memory 804 may include a cache memory (e.g., a cache memory of theprocessor 802), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, asolid state memory device, one or more hard disk drives, memristor-basedarrays, other forms of volatile and non-volatile memory, or acombination of different types of memory. In some aspects, the memory804 may include a non-transitory computer-readable medium. The memory804 may store instructions 806. The instructions 806 may includeinstructions that, when executed by the processor 802, cause theprocessor 802 to perform operations described herein, for example,aspects of FIGS. 1 and 2 . Instructions 806 may also be referred to asprogram code. The program code may be for causing a wirelesscommunication device to perform these operations, for example by causingone or more processors (such as processor 802) to control or command thewireless communication device to do so. The terms “instructions” and“code” should be interpreted broadly to include any type ofcomputer-readable statement(s). For example, the terms “instructions”and “code” may refer to one or more programs, routines, sub-routines,functions, procedures, etc. “Instructions” and “code” may include asingle computer-readable statement or many computer-readable statements.

The communication module 808 may be implemented via hardware, software,or combinations thereof. For example, the communication module 808 maybe implemented as a processor, circuit, and/or instructions 806 storedin the memory 804 and executed by the processor 802. In some examples,the communication module 808 can be integrated within the modemsubsystem 812. For example, the communication module 808 can beimplemented by a combination of software components (e.g., executed by aDSP or a general processor) and hardware components (e.g., logic gatesand circuitry) within the modem subsystem 812. The communication module808 may communicate with one or more components of BS 800 to implementvarious aspects of the present disclosure, for example, aspects of FIGS.1 and 2 .

As shown, the transceiver 810 may include the modem subsystem 812 andthe RF unit 814. The transceiver 810 can be configured to communicatebi-directionally with other devices, such as the UEs 115, 215 and/or BS800 and/or another core network element. The modem subsystem 812 may beconfigured to modulate and/or encode data according to a MCS, e.g., aLDPC coding scheme, a turbo coding scheme, a convolutional codingscheme, a digital beamforming scheme, etc. The RF unit 814 may beconfigured to process (e.g., perform analog to digital conversion ordigital to analog conversion, etc.) modulated/encoded data (e.g., RRCconfigurations, MIB, PDSCH data and/or PDCCH DCIs, etc.) from the modemsubsystem 812 (on outbound transmissions) or of transmissionsoriginating from another source such as a UE 115, 215, and/or UE 700.The RF unit 814 may be further configured to perform analog beamformingin conjunction with the digital beamforming. Although shown asintegrated together in transceiver 810, the modem subsystem 812 and/orthe RF unit 814 may be separate devices that are coupled together at theBS 800 to enable the BS 800 to communicate with other devices.

The RF unit 814 may provide the modulated and/or processed data, e.g.data packets (or, more generally, data messages that may contain one ormore data packets and other information), to the antennas 816 fortransmission to one or more other devices. The antennas 816 may furtherreceive data messages transmitted from other devices and provide thereceived data messages for processing and/or demodulation at thetransceiver 810. The transceiver 810 may provide the demodulated anddecoded data (e.g., PUSCH data, PUCCH UCI, MSG1, MSG3, etc.) to thecommunication module 808 for processing. The antennas 816 may includemultiple antennas of similar or different designs in order to sustainmultiple transmission links.

In an aspect, the BS 800 can include multiple transceivers 810implementing different RATs (e.g., NR and LTE). In an aspect, the BS 800can include a single transceiver 810 implementing multiple RATs (e.g.,NR and LTE). In an aspect, the transceiver 810 can include variouscomponents, where different combinations of components can implementdifferent RATs.

Further aspects of the present disclosure include the following clauses:

1. A method of wireless communication performed by a user equipment(UE), the method comprising:

operating in a Dual SIM Dual Standby (DSDS) mode in which a firstsubscriber identity module (SIM) is designated as a default datasubscription (DDS);

transmitting a sounding reference signal (SRS) from a communication portof the UE, wherein the SRS has a timing offset assigned by a networkassociated with the first SIM;

receiving paging messages from a network associated with a second SIM;

determining an offset adjustment to avoid a collision between the SRSand the paging messages;

sending a request to the network associated with the first SIM to adjustthe timing offset according to the offset adjustment; and

receiving an offset change configuration from the network associatedwith the first SIM.

2. The method of clause 1, wherein determining the offset adjustmentfurther includes calculating the offset adjustment to further avoid acollision between the SRS and measurement for an item selected from alist consisting of: reference signal received power (RSRP), receivedsignal strength indicator (RSSI), and signal and interference to noiseratio (SINR).

3. The method of clauses 1-2, wherein the network associated with thefirst SIM and the network associated with the second SIM are a samenetwork.

4. The method of clauses 1-2, wherein the network associated with thefirst SIM and the network associated with the second SIM are differentnetworks.

5. The method of clauses 1-4, wherein sending the request to the networkassociated with the first SIM comprises:

transmitting a media access control (MAC) control element (CE) from theUE to the network associated with the first SIM, the MAC CE including anindication of the offset adjustment.

6. The method of clauses 1-5, further comprising:

subsequent to receiving the offset change configuration, transmittingthe SRS according to the offset adjustment.

7. The method of clauses 1-6, wherein receiving the offset changeconfiguration includes receiving a radio resource control (RRC) messagereconfiguring the timing offset assigned by the network associated withthe first SIM.

8. The method of clauses 1-7, wherein determining the offset adjustmentcomprises:

determining that an occurrence of the SRS falls within a first-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and

in response to determining that the occurrence of the SRS falls withinthe first-in-time half, determining to pre-pone the SRS.

9. The method of clauses 1-7, wherein determining the offset adjustmentcomprises:

determining that an occurrence of the SRS falls within a second-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and

in response to determining that the occurrence of the SRS falls withinthe second-in-time half, determining to postpone the SRS.

10. The method of clauses 1-9, wherein determining the offset adjustmentincludes applying a function dependent upon a numerology applied by thefirst SIM.

11. A non-transitory computer-readable medium having program coderecorded thereon for wireless communication by a user equipment (UE),the program code comprising:

code for transmitting a sounding reference signal (SRS) with aperiodicity and a timing offset for an active-mode subscriber identitymodule (SIM) of the UE;

code for performing a radio frequency (RF) tune away to accommodatedecoding paging signals and received signal measurement for an idle-modeSIM of the UE, wherein the RF tune away collides with an SRS occurrence;

code for generating a request for adjustment of the timing offset toavoid collision of the RF tune away and the SRS occurrence;

code for transmitting the request for adjustment to a network servingthe active-mode SIM; and

code for adjusting the timing offset in response to receipt ofconfiguration information from the network serving the active-mode SIM.

12. The non-transitory computer-readable medium of clause 11, whereinthe received signal measurement includes an item selected from a listconsisting of: reference signal received power (RSRP), received signalstrength indicator (RSSI), and signal and interference to noise ratio(SINR).

13. The non-transitory computer-readable medium of clauses 11-12,wherein transmitting the request for adjustment comprises:

transmitting a media access control (MAC) control element (CE) from theUE to the network serving the active-mode SIM, the MAC CE including anindication of a timing offset adjustment.

14. The non-transitory computer-readable medium of clauses 11-13,further comprising code for receiving a radio resource control (RRC)message with the configuration information.

15. The non-transitory computer-readable medium of clauses 11-14,wherein the code for generating the request comprises:

code for determining that an occurrence of the SRS falls within afirst-in-time half of a duration of the RF tune away; and

code for, in response to determining that the occurrence of the SRSfalls within the first-in-time half, determining to pre-pone the SRS.

16. The non-transitory computer-readable medium of clauses 11-14,wherein the code for generating the request comprises:

code for determining that an occurrence of the SRS falls within asecond-in-time half of a duration of the RF tune away; and

code for, in response to determining that the occurrence of the SRSfalls within the second-in-time half, determining to postpone the SRS.

17. The non-transitory computer-readable medium of clauses 11-16,wherein the code for generating the request includes code for applying afunction dependent upon a numerology applied by the active-mode SIM tocalculate either a left-shift or a right-shift of a particular number ofslots for the timing offset.

18. A user equipment (UE) comprising:

a first subscriber identity module (SIM) and a second SIM;

means for operating the first SIM in an active-mode and operating thesecond SIM in an idle mode;

means for generating a request to reconfigure a timing offset of asounding reference signal (SRS) associated with the first SIM, includingcalculating a number of slots for adjusting the timing offset to avoidcollision with paging decode and signal measurement associated with thesecond SIM;

means for receiving configuration information from a network serving thefirst SIM, the configuration information adjusting the timing offset inaccordance with the request; and

means for transmitting the SRS according to the configurationinformation.

19. The UE of clause 18, wherein the network serving the first SIM is asame network serving the second SIM.

20. The UE of clauses 18-19, wherein the network serving the first SIMis different from a network serving the second SIM.

21. The UE of clauses 18-20, wherein the signal measurement comprises atleast one item selected from a list consisting of: reference signalreceived power (RSRP), received signal strength indicator (RSSI), andsignal and interference to noise ratio (SINR).

22. The UE of clauses 18-21, wherein the means for generating therequest comprises:

means for determining that an occurrence of the SRS falls within afirst-in-time half of a tune away period of radio frequency (RF)hardware shared by the first SIM and the second SIM; and

means for determining to pre-pone the SRS in response to determiningthat the occurrence of the SRS falls within the first-in-time half.

23. The UE of clauses 18-21, wherein the means for generating therequest comprises:

means for determining that an occurrence of the SRS falls within asecond-in-time half of a tune away period of radio frequency (RF)hardware shared by the first SIM and the second SIM; and

means for determining to postpone the SRS in response to determiningthat the occurrence of the SRS falls within the second-in-time half.

24. A user equipment (UE) comprising:

a first subscriber identity module (SIM) associated with a first serviceprovider subscription and a second SIM associated with a second serviceprovider subscription;

a modem configured to interface with a base station; and

a processor configured to interface with the modem and to access thefirst SIM and the second SIM, wherein the modem is further configuredto:

-   -   operate in a Dual SIM Dual Standby (DSDS) mode in which the        first SIM is in an active-mode and the second SIM is in an idle        mode;    -   transmitting a sounding reference signal (SRS) from a        communication port of the UE, wherein the SRS has a timing        offset assigned by a network associated with the first SIM;    -   performing signal measurement with respect to a signal received        from a network associated with a second SIM;    -   determining an offset adjustment to avoid a collision between        the SRS and the signal measurement;    -   sending a request to the network associated with the first SIM        to adjust the timing offset according to the offset adjustment;        and    -   receiving an offset change configuration from the network        associated with the first SIM.

25. The UE of clause 24, wherein the processor is further configured todetermine the offset adjustment to avoid colliding the SRS with pagedecode associated with the second SIM.

26. The UE of clauses 24-25, wherein the processor is configured todetermine the offset adjustment, including:

determining that an occurrence of the SRS falls within a first-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and

in response to determining that the occurrence of the SRS falls withinthe first-in-time half, determining to pre-pone the SRS.

27. The UE of clauses 24-25, wherein the processor is configured todetermine the offset adjustment, including:

determining that an occurrence of the SRS falls within a second-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and

in response to determining that the occurrence of the SRS falls withinthe second-in-time half, determining to postpone the SRS.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a DSP, an ASIC, an FPGA or other programmablelogic device, discrete gate or transistor logic, discrete hardwarecomponents, or any combination thereof designed to perform the functionsdescribed herein. A general-purpose processor may be a microprocessor,but in the alternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations. Also, as used herein, including in the claims, “or” as usedin a list of items (for example, a list of items prefaced by a phrasesuch as “at least one of” or “one or more of”) indicates an inclusivelist such that, for example, a list of [at least one of A, B, or C]means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

As those of some skill in this art will by now appreciate and dependingon the particular application at hand, many modifications, substitutionsand variations can be made in and to the materials, apparatus,configurations and methods of use of the devices of the presentdisclosure without departing from the spirit and scope thereof. In lightof this, the scope of the present disclosure should not be limited tothat of the particular aspects illustrated and described herein, as theyare merely by way of some examples thereof, but rather, should be fullycommensurate with that of the claims appended hereafter and theirfunctional equivalents.

What is claimed is:
 1. A method of wireless communication performed by auser equipment (UE), the method comprising: operating in a Dual SIM DualStandby (DSDS) mode in which a first subscriber identity module (SIM) isdesignated as a default data subscription (DDS); transmitting a soundingreference signal (SRS) from a communication port of the UE, wherein theSRS has a timing offset assigned by a network associated with the firstSIM; receiving paging messages from a network associated with a secondSIM; determining an offset adjustment to avoid a collision between theSRS and the paging messages; sending a request to the network associatedwith the first SIM to adjust the timing offset according to the offsetadjustment; and receiving an offset change configuration from thenetwork associated with the first SIM.
 2. The method of claim 1, whereindetermining the offset adjustment further includes calculating theoffset adjustment to further avoid a collision between the SRS andmeasurement for an item selected from a list consisting of: referencesignal received power (RSRP), received signal strength indicator (RSSI),and signal and interference to noise ratio (SINR).
 3. The method ofclaim 1, wherein the network associated with the first SIM and thenetwork associated with the second SIM are a same network.
 4. The methodof claim 1, wherein the network associated with the first SIM and thenetwork associated with the second SIM are different networks.
 5. Themethod of claim 1, wherein sending the request to the network associatedwith the first SIM comprises: transmitting a media access control (MAC)control element (CE) from the UE to the network associated with thefirst SIM, the MAC CE including an indication of the offset adjustment.6. The method of claim 1, further comprising: subsequent to receivingthe offset change configuration, transmitting the SRS according to theoffset adjustment.
 7. The method of claim 1, wherein receiving theoffset change configuration includes receiving a radio resource control(RRC) message reconfiguring the timing offset assigned by the networkassociated with the first SIM.
 8. The method of claim 1, whereindetermining the offset adjustment comprises: determining that anoccurrence of the SRS falls within a first-in-time half of a tune awayperiod of radio frequency (RF) hardware shared by the first SIM and thesecond SIM; and in response to determining that the occurrence of theSRS falls within the first-in-time half, determining to pre-pone theSRS.
 9. The method of claim 1, wherein determining the offset adjustmentcomprises: determining that an occurrence of the SRS falls within asecond-in-time half of a tune away period of radio frequency (RF)hardware shared by the first SIM and the second SIM; and in response todetermining that the occurrence of the SRS falls within thesecond-in-time half, determining to postpone the SRS.
 10. The method ofclaim 1, wherein determining the offset adjustment includes applying afunction dependent upon a numerology applied by the first SIM.
 11. Anon-transitory computer-readable medium having program code recordedthereon for wireless communication by a user equipment (UE), the programcode comprising: code for transmitting a sounding reference signal (SRS)with a periodicity and a timing offset for an active-mode subscriberidentity module (SIM) of the UE; code for performing a radio frequency(RF) tune away to accommodate decoding paging signals and receivedsignal measurement for an idle-mode SIM of the UE, wherein the RF tuneaway collides with an SRS occurrence; code for generating a request foradjustment of the timing offset to avoid collision of the RF tune awayand the SRS occurrence; code for transmitting the request for adjustmentto a network serving the active-mode SIM; and code for adjusting thetiming offset in response to receipt of configuration information fromthe network serving the active-mode SIM.
 12. The non-transitorycomputer-readable medium of claim 11, wherein the received signalmeasurement includes an item selected from a list consisting of:reference signal received power (RSRP), received signal strengthindicator (RSSI), and signal and interference to noise ratio (SINR). 13.The non-transitory computer-readable medium of claim 11, whereintransmitting the request for adjustment comprises: transmitting a mediaaccess control (MAC) control element (CE) from the UE to the networkserving the active-mode SIM, the MAC CE including an indication of atiming offset adjustment.
 14. The non-transitory computer-readablemedium of claim 11, further comprising code for receiving a radioresource control (RRC) message with the configuration information. 15.The non-transitory computer-readable medium of claim 11, wherein thecode for generating the request comprises: code for determining that anoccurrence of the SRS falls within a first-in-time half of a duration ofthe RF tune away; and code for, in response to determining that theoccurrence of the SRS falls within the first-in-time half, determiningto pre-pone the SRS.
 16. The non-transitory computer-readable medium ofclaim 11, wherein the code for generating the request comprises: codefor determining that an occurrence of the SRS falls within asecond-in-time half of a duration of the RF tune away; and code for, inresponse to determining that the occurrence of the SRS falls within thesecond-in-time half, determining to postpone the SRS.
 17. Thenon-transitory computer-readable medium of claim 11, wherein the codefor generating the request includes code for applying a functiondependent upon a numerology applied by the active-mode SIM to calculateeither a left-shift or a right-shift of a particular number of slots forthe timing offset.
 18. A user equipment (UE) comprising: a firstsubscriber identity module (SIM) and a second SIM; means for operatingthe first SIM in an active-mode and operating the second SIM in an idlemode; means for generating a request to reconfigure a timing offset of asounding reference signal (SRS) associated with the first SIM, includingcalculating a number of slots for adjusting the timing offset to avoidcollision with paging decode and signal measurement associated with thesecond SIM; means for receiving configuration information from a networkserving the first SIM, the configuration information adjusting thetiming offset in accordance with the request; and means for transmittingthe SRS according to the configuration information.
 19. The UE of claim18, wherein the network serving the first SIM is a same network servingthe second SIM.
 20. The UE of claim 18, wherein the network serving thefirst SIM is different from a network serving the second SIM.
 21. The UEof claim 18, wherein the signal measurement comprises at least one itemselected from a list consisting of: reference signal received power(RSRP), received signal strength indicator (RSSI), and signal andinterference to noise ratio (SINR).
 22. The UE of claim 18, wherein themeans for generating the request comprises: means for determining thatan occurrence of the SRS falls within a first-in-time half of a tuneaway period of radio frequency (RF) hardware shared by the first SIM andthe second SIM; and means for determining to pre-pone the SRS inresponse to determining that the occurrence of the SRS falls within thefirst-in-time half.
 23. The UE of claim 18, wherein the means forgenerating the request comprises: means for determining that anoccurrence of the SRS falls within a second-in-time half of a tune awayperiod of radio frequency (RF) hardware shared by the first SIM and thesecond SIM; and means for determining to postpone the SRS in response todetermining that the occurrence of the SRS falls within thesecond-in-time half.
 24. A user equipment (UE) comprising: a firstsubscriber identity module (SIM) associated with a first serviceprovider subscription and a second SIM associated with a second serviceprovider subscription; a modem configured to interface with a basestation; and a processor configured to interface with the modem and toaccess the first SIM and the second SIM, wherein the modem is furtherconfigured to: operate in a Dual SIM Dual Standby (DSDS) mode in whichthe first SIM is in an active-mode and the second SIM is in an idlemode; transmitting a sounding reference signal (SRS) from acommunication port of the UE, wherein the SRS has a timing offsetassigned by a network associated with the first SIM; performing signalmeasurement with respect to a signal received from a network associatedwith the second SIM; determining an offset adjustment to avoid acollision between the SRS and the signal measurement; sending a requestto the network associated with the first SIM to adjust the timing offsetaccording to the offset adjustment; and receiving an offset changeconfiguration from the network associated with the first SIM.
 25. The UEof claim 24, wherein the processor is further configured to determinethe offset adjustment to avoid colliding the SRS with page decodeassociated with the second SIM.
 26. The UE of claim 24, wherein theprocessor is configured to determine the offset adjustment, including:determining that an occurrence of the SRS falls within a first-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and in response to determining thatthe occurrence of the SRS falls within the first-in-time half,determining to pre-pone the SRS.
 27. The UE of claim 24, wherein theprocessor is configured to determine the offset adjustment, including:determining that an occurrence of the SRS falls within a second-in-timehalf of a tune away period of radio frequency (RF) hardware shared bythe first SIM and the second SIM; and in response to determining thatthe occurrence of the SRS falls within the second-in-time half,determining to postpone the SRS.